Adjust or replace the back up light switch, located somewhere next to the shift lever.
try the brake switch on the back of the brake pedal
It could, if the lights are on all the time.
loose connection to the dimmer switch. Check the dimmer switch by dialing off low - hi and back a few times while you have the parking lights on. Also check for a lose fuse.
if the fuse is good then check the relay/flasher then the switch on the side of the colum
The Turn Signal Switch is bad in the column and needs to be replaced.
Under your head light button u have park lights and under that is your hazerd lights and under that is a lever that gose sideways that is what u r looking for
Bad bulbs they are double filament or Bad stop light fuse or bad stop light switch
See this link: http://wiki.answers.com/Q/What_do_flashing_lights_on_the_rear_window_wiper_and_ac_buttons_mean_on_a_%2798_Plymouth_Voyager_van It has something to do with a HVAC system check and reset.
check for a bad or misadjusted stop light switch at the upper end of the brake pedal under dash area
Replace the switch under the dash. First remove the cover, then find the switch mounted neer the brake pedel.Remove the wiring plug then disconect from the bracket.
Probably needs a new light switch. If you jiggle the switch do they flicker?
Check your fuses